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[Bug target/83488] New: [8 Regression] ICE on a CET test-case


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83488

            Bug ID: 83488
           Summary: [8 Regression] ICE on a CET test-case
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
                CC: igor.v.tsimbalist at intel dot com
  Target Milestone: ---
              Host: x86_64-linux-gnu

Starting from r253977 we ICE on:

$ gcc /home/marxin/Programming/gcc/gcc/testsuite/gcc.target/i386/cet-rdssp-1.c
-mavx5124vnniw
/home/marxin/Programming/gcc/gcc/testsuite/gcc.target/i386/cet-rdssp-1.c: In
function ‘test’:
/home/marxin/Programming/gcc/gcc/testsuite/gcc.target/i386/cet-rdssp-1.c:32:1:
error: unrecognizable insn:
 }
 ^
(insn 8 7 9 2 (set (reg:DI 87)
        (unspec_volatile:DI [
                (reg:DI 88)
            ] UNSPECV_NOP_RDSSP))
"/home/marxin/Programming/gcc/gcc/testsuite/gcc.target/i386/cet-rdssp-1.c":19
-1
     (nil))
during RTL pass: vregs
/home/marxin/Programming/gcc/gcc/testsuite/gcc.target/i386/cet-rdssp-1.c:32:1:
internal compiler error: in extract_insn, at recog.c:2306
0x5afca1 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
        ../../gcc/rtl-error.c:108
0x5afcc0 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
        ../../gcc/rtl-error.c:116
0xb1a757 extract_insn(rtx_insn*)
        ../../gcc/recog.c:2306
0x8c54cd instantiate_virtual_regs_in_insn
        ../../gcc/function.c:1591
0x8c54cd instantiate_virtual_regs
        ../../gcc/function.c:1960
0x8c54cd execute
        ../../gcc/function.c:2009

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